SkySat 4 Hour Ortho / Fast Rectification FAQs

What is fast-rectification?

Does fast-rectification apply to all assets?

How long does fast-rectification take?

Will all customers receive fast-rectification?

Will customers be able to see fast-rectification Scenes in Explorer?

Is there a parameter in metadata to indicate whether a Scene has fast or full rectification?

 

What is fast-rectification?

Fast-rectification is publication of the first orthorectification of a SkySatScene, which relies on coarse “Seth” RPCs rather than the bundle adjusted (“BA”) RPCs used for full rectification. This results in a high absolute positional accuracy (near matching full rectification), but a slightly degraded relative / scene-to-scene accuracy, with an average ~4m RMSE rather than the ~1m RMSE achieved with full rectification.

 

Does fast-rectification apply to all assets?

No, fast-rectification only applies to Scenes, hence SkySatCollects will not publish early.

 

How long does fast-rectification take?

The typical latency for a Scene that’s been fast-rectified is ~4 hours, that’s between capture and publication (hence the Scene spends about ~2 hours in the processing Pipeline). This is roughly 2 to 4 hours faster than the fully rectified product. 

 

Will all customers receive fast-rectification?

No, initially fast-rectification will only be available for Assured Tasking customers, as an upsell for purchasing the Assured product.

 

Will customers be able to see fast-rectification Scenes in Explorer?

Yes, but only the Assured customers that tasked the image, due to the one month publication delay associated with SDA. The fast-rectification is replaced by the full-rectification, hence archive customers will only see the full rectification product once it publishes broadly.

 

Is there a parameter in metadata to indicate whether a Scene has fast or full rectification?

Yes, the publishing_stage parameter has been added to all SkySat assets, where ‘preview’ represents fast-rectification (and L1A) and ‘finalized’ represents full rectification.

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